applba

@echo off &setlocal enabledelayedexpansion &color 17
:limit
set /p n1=请输入最大计算范围：
set /a n=!n1!  && if  !n! lss 2 (echo 您输入的数字有误！&goto limit)
:gen
set /a "a=(!random!%%!n!+1),b=(!random!%%!n!+1)"
if !a! gtr !b! (
	set /a r0=!a!-!b!
	set /p "r1=!a!-!b!=?_"
) else (
		set /a r0=!a!+!b!
		if !r0! GTR !n! goto gen
		set /p "r1=!a!+!b!=?_"
	)
if !r0! neq !r1! (echo "你答错了！正确答案是：!r0!" ) else (echo 您答对了！请再接再厉吧~)
pause>nul&cls&goto gen
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